These changes may act upon a diaphragm or a piston which in turn activates the valve, examples of this type of valve found commonly are safety valves fitted to hot water systems or boilers.
这些变化可能采取行动的一个膜片或活塞这反过来又激活阀门，阀门这种类型的例子，发现常见的有安全阀门安装在系统或热水锅炉。
These changes may act upon a diaphragm or a piston which in turn activates the valve, examples of this type of valve found commonly are safety valves fitted to hot water systems or boilers.
这些变化可能采取行动的一个膜片或活塞这反过来又激活阀门，阀门这种类型的例子，发现常见的有安全阀门安装在系统或热水锅炉。
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